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World's Largest Spider Web Discovered in Romanian Cave

11/7/2025

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Summary

Story summary

Romanian scientists identified the world's largest spider web in Sulfur Cave, spanning 1,140 square feet and housing about 111,000 spiders.
The web hosts barn funnel weavers and sheetweb spiders, a coexistence not seen in such numbers.
Researchers used stable isotope analysis to show the spiders feed on midges that consume sulfur-eating microbes, enabling them to thrive in the cave.

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Story summary

Romanian scientists identified the world's largest spider web in Sulfur Cave, spanning 1,140 square feet and housing about 111,000 spiders.
The web hosts barn funnel weavers and sheetweb spiders, a coexistence not seen in such numbers.
Researchers used stable isotope analysis to show the spiders feed on midges that consume sulfur-eating microbes, enabling them to thrive in the cave.